CN104802655A - Open circuit diagnosis system of high-voltage direct current end of electric driving system of electric automobile - Google Patents
Open circuit diagnosis system of high-voltage direct current end of electric driving system of electric automobile Download PDFInfo
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- CN104802655A CN104802655A CN201410035036.3A CN201410035036A CN104802655A CN 104802655 A CN104802655 A CN 104802655A CN 201410035036 A CN201410035036 A CN 201410035036A CN 104802655 A CN104802655 A CN 104802655A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
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- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention discloses an open circuit diagnosis system of a high-voltage direct current end of an electric driving system of an electric automobile. The system comprises a positive switch, a pre-charging switch, a pre-charging resistor, a negative switch, an open circuit voltage detection device and a battery management system, wherein the pre-charging switch is connected in series with the pre-charging resistor and then is connected in parallel to the two ends of the positive switch; the open circuit voltage detection device is arranged at the two ends of the negative switch in parallel for detecting voltage values at the two ends of the negative switch; the two ends of the positive switch are connected between a positive end of a high-voltage battery and a positive electrode of the high-voltage direct current end; the two ends of the negative switch are connected between the negative end of the high-voltage battery and the negative electrode of the high-voltage direct current end; the battery management system is used for controlling the on and off of the positive switch, the pre-charging switch and the negative switch and is communicated with the open circuit voltage detection device and an entire control system. In a high-voltage power-on flow, whether a direct current end is connected with an inverter can be safely and effectively detected according to change condition of voltage at the two ends of the negative switch before and after closing of the pre-charging switch.
Description
Technical field
The present invention relates to electronic (pure electronic or hybrid power) automobile high-voltage safety technology, particularly a kind of electric drive system for electric vehicles HVDC end open circuit diagnostic system.
Background technology
Automotive safety is all the emphasis that people pay close attention to all the time, current power automobile (comprising pure electric and hybrid vehicle) power drive system have employed high-pressure system mostly, high-voltage safety becomes electronlmobil field and pays close attention to object, and high-voltage safety technology becomes one of this field gordian technique.
Inverter is as electric drive system for electric vehicles core component, its high-voltage interlocking (HVIL) loop is realized by upper cover plate under normal circumstances, correct sequence of erection rectifies pole (T+), negative pole (T-) and the output of UVW three-phase for connecting HVDC, after normal connection, close inverter upper cover plate, high-voltage interlocking circuit closed, allows high pressure to power on.If do not install inverter upper cover plate, high-voltage interlocking loop disconnects, and does not now allow high pressure to power on, there is not high pressure risk.But, find in practical application that HVDC end exists following potential high-voltage safety risk: because HVDC end (T+, T-) does not design HVIL separately, in personnel's faulty operation situation, HVDC end (T+, T-) is not installed to inverter internal, but closed inverter upper cover plate, high-voltage interlocking circuit closed, permission high pressure powers on, if now start high-pressure system, because HVDC end (T+, T-) is outside exposed, there is potential high pressure electric shock risk, as shown in Figure 1.
For the problems referred to above, existing solution is the HVIL designed at HVDC two ends (T+, T-), and the shortcoming of the program is: 1) connector cost is higher, and volume is larger; 2) the inner cabling of inverter end HVIL is complicated; 3) HVIL lost efficacy the wrong diagnosis brought.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of electric drive system for electric vehicles HVDC end open circuit diagnostic system, safety, effectively detection HVDC end whether can access inverter, evade HVDC end and do not design the potential high pressure risk that high-voltage interlocking brings, simple and convenient, be easy to transformation, implementation cost is low.
For solving the problems of the technologies described above, electric drive system for electric vehicles HVDC end open circuit diagnostic system provided by the invention, it comprises positive switch, precharge switch, pre-charge resistance, negative switch, open circuit voltage detecting device, battery management system;
Described precharge switch and pre-charge resistance are parallel to positive switch two ends after connecting;
Described open circuit voltage detecting device, is installed in parallel in negative switch two ends, is used for detecting the magnitude of voltage at negative switch two ends;
Described positive switch two ends, rectify between pole for being connected on high-tension battery anode with HVDC;
Described negative switch two ends, for being connected on high-tension battery negative terminal with between HVDC end negative pole;
HVDC rectifies pole, for being connected to inverter positive input terminal;
HVDC end negative pole, for being connected to inverter negative input end;
Described battery management system, for controlling described positive switch, precharge switch, negative switch break-make, and with open circuit voltage detecting device, whole-control system communication; Described battery management system, working process is as follows:
One. control positive switch, precharge switch, negative switch are all in off-state;
If two. receive high pressure and to power on desired signal, then carry out step 3;
Three. the closed front voltage V at the negative switch two ends that record open circuit voltage detecting device detects
0;
Four. control precharge switch and close;
Five. the closed rear voltage V at the negative switch two ends that record open circuit voltage detecting device detects
1;
If six. | V
1-V
0| <N, N are the positive number demarcated, then export HVDC end and do not access fault of converter signal, carry out step 12; Otherwise carry out step 7;
Seven. send HVDC and rectify normal access signal to vehicle management system;
Eight. to power on instruction when receiving high pressure that vehicle management system sends, then control negative switch and close;
If nine. in setting-up time, precharge does not complete, then export precharge failure breakdown signal, carry out step 12; If precharge completes in setting-up time, then carry out step 10;
Ten. control positive switch and close;
11. high pressure powers on successfully, terminates;
12. high pressure powers on unsuccessfully, controls positive switch, precharge switch and negative switch and disconnects, terminate.
Preferably, described positive switch, precharge switch, negative switch are relay or switching valve.
Preferably, in step 11, high pressure powers on successfully, and described battery management system controls precharge switch and disconnects, and terminates.
Preferably, in step 4, after described battery management system sends precharge switch Closed control signal, and judge whether precharge switch closes, if precharge switch is closed, then carry out step 5; Otherwise, export precharge switch connection failure breakdown signal, carry out step 12.
Preferably, in step 8, after described battery management system sends negative switch Closed control signal, and judge whether negative switch closes, if negative switch is closed, then carry out step 9; Otherwise output negative pole switch connection failure breakdown signal, carries out step 12.
Preferably, in step 10, after described battery management system sends positive switch Closed control signal, and judge whether positive switch closes, if positive switch is closed, then carry out step 11; Otherwise output cathode switch connection failure breakdown signal, carries out step 12.。
Electric drive system for electric vehicles HVDC end open circuit diagnostic system of the present invention, before high pressure powers on, battery management system BMS carries out initialization, makes positive switch S+, precharge switch Sp, negative switch S-all be in off-state; Have high pressure power on demand time, battery management system BMS record negative switch two ends closed before voltage V
0, then control precharge switch Sp and close, the closed rear voltage V at record negative switch two ends
1, and judge that precharge switch Sp closes the change of voltage at the negative switch S-two ends of front and back | V
1-V
0| whether be more than or equal to a scalar quantity N, scalar quantity N need meet can detect precharge switch Sp close before and after negative switch S-both end voltage have obvious saltus step, if precharge switch Sp close before and after the change of voltage at negative switch S-two ends | V
1-V
0| be more than or equal to a scalar quantity N, then judge that HVDC end (T+, T-) accesses inverter, allow vehicle management system VMS to send high pressure and to power on instruction, otherwise export HVDC and rectify pole (T+, T-) and do not access fault of converter signal.Electric drive system for electric vehicles HVDC end open circuit diagnostic system of the present invention, power in flow process at high pressure, the situation of change of the negative switch both end voltage before and after being closed by precharge switch can safety, whether effective detection HVDC end accesses inverter, and due to when precharge switch Sp starts closed, positive switch S+ and negative switch S-is in off-state, even if HVDC end (T+, T-) inverter is not connected, also high pressure risk can not be brought, HVDC end (T+ can be evaded, T-) the potential high pressure risk that high-voltage interlocking (HVIL) brings is not designed, simple and convenient, be easy to transformation, implementation cost is low.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, below the accompanying drawing that will use required for the present invention is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the potential risk schematic diagram of the non-installation high-voltage interlocking of HVDC end;
Fig. 2 is electric drive system for electric vehicles HVDC end of the present invention open circuit diagnostic system one embodiment schematic diagram;
The battery management system working process schematic diagram of Fig. 3 electric drive system for electric vehicles HVDC of the present invention end open circuit diagnostic system one embodiment;
The effect schematic diagram of Fig. 4 electric drive system for electric vehicles HVDC of the present invention end open circuit diagnostic system one embodiment.
Detailed description of the invention
Below in conjunction with accompanying drawing, carry out clear, complete description to the technical scheme in the present invention, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope of protection of the invention.
Embodiment one
Electric drive system for electric vehicles HVDC end open circuit diagnostic system, as shown in Figure 2, comprises positive switch S+, precharge switch Sp, pre-charge resistance R, negative switch S-, open circuit voltage detecting device VM, battery management system BMS;
Described precharge switch Sp and pre-charge resistance R is parallel to positive switch S+ two ends after connecting;
Described open circuit voltage detecting device VM, is installed in parallel in negative switch S-two ends, is used for detecting the magnitude of voltage at negative switch S-two ends;
Described positive switch S+ two ends, rectify between the T+ of pole for being connected on high-tension battery E anode with HVDC;
Described negative switch S-two ends, for being connected on high-tension battery E negative terminal with between HVDC end negative pole T-;
HVDC rectifies pole T+, for being connected to inverter positive input terminal;
HVDC end negative pole T-, for being connected to inverter negative input end;
Described battery management system BMS, for controlling described positive switch S+, precharge switch Sp, negative switch S-break-make, and communicates with open circuit voltage detecting device VM, vehicle management system VMS; Described battery management system BMS, as shown in Figure 3, working process is as follows:
One. before high pressure powers on, carry out initialization, control positive switch S+, precharge switch Sp, negative switch S-are in off-state;
If two. receive high pressure and to power on desired signal, then carry out step 3;
Three. the closed front voltage V at the negative switch S-two ends that record open circuit voltage detecting device VM detects
0;
Four. control precharge switch Sp and close;
Five. the closed rear voltage V at the negative switch S-two ends that record open circuit voltage detecting device VM detects
1;
If six. | V
1-V
0| <N, N are the positive number demarcated, then export HVDC end (T+, T-) and do not access fault of converter signal, carry out step 12; Otherwise carry out step 7;
Seven. send HVDC and rectify normal access signal to vehicle management system VMS;
Eight. to power on instruction when receiving high pressure that vehicle management system VMS sends, then control negative switch S-and close;
If nine. in setting-up time, precharge does not complete, then export precharge failure breakdown signal, carry out step 12; If precharge completes in setting-up time, then carry out step 10;
Ten. control positive switch S+ and close;
11. high pressure powers on successfully, terminates;
12. high pressure powers on unsuccessfully, controls positive switch S+, precharge switch Sp and negative switch S-and disconnects, and stops connecting high pressure, terminates.
Described positive switch S+, precharge switch Sp, negative switch S-can be the electronic devices and components that relay, switching valve etc. have on-off action.
Preferably, in step 11, high pressure powers on successfully, and described battery management system controls precharge switch and disconnects, and terminates.
Preferably, in step 4, after described battery management system BMS sends precharge switch Closed control signal, and judge whether precharge switch Sp closes, if precharge switch Sp is closed, then carry out step 5; Otherwise, export precharge switch connection failure breakdown signal, carry out step 12.
In step 8, after described battery management system BMS sends negative switch Closed control signal, and judge whether negative switch S-closes, if negative switch S-is closed, then carry out step 9; Otherwise output negative pole switch connection failure breakdown signal, carries out step 12.
In step 10, after described battery management system BMS sends positive switch Closed control signal, and judge whether positive switch S+ closes, if positive switch S+ is closed, then carry out step 11; Otherwise output cathode switch connection failure breakdown signal, carries out step 12.
Switch (precharge switch Sp, positive switch S+, negative switch S-) is grouped into by control part and enforcement division in general, by the voltage of the actuating station both sides of comparing switch, battery management system BMS judges whether switch closes, both sides voltage is equal, is judged as that switch is closed.
Whether precharge completes, can by judging that the voltage (being namely connected on the voltage at the electric capacity C two ends between inverter input terminal) between inverter positive input terminal and negative input end realizes, when electric capacity C both end voltage reach actual high-voltage battery both end voltage setting ratio X (X be less than 1 positive number, X can demarcate), then think that precharge completes.
The electric drive system for electric vehicles HVDC end open circuit diagnostic system of embodiment one, if inverter is not accessed at HVDC end (T+, T-) two ends, the then closed front and back of precharge switch Sp, the negative switch S-both end voltage that open circuit voltage detecting device VM detects is substantially constant; If HVDC end (T+, T-) two ends access inverter, then the closed front and back of precharge switch Sp, the negative switch S-both end voltage that open circuit voltage detecting device VM detects has comparatively significantly saltus step.Therefore, utilize this principle, as long as detect that in above-mentioned high pressure power up precharge switch Sp closed front and back negative switch S-both end voltage does not have obvious saltus step, can judge that HVDC end (T+, T-) does not access inverter, stop continuing high pressure by software control and power on.The electric drive system for electric vehicles HVDC end open circuit diagnostic system of embodiment one, before high pressure powers on, battery management system BMS carries out initialization, makes positive switch S+, precharge switch Sp, negative switch S-all be in off-state; Have high pressure power on demand time, battery management system BMS record negative switch two ends closed before voltage V0, then control precharge switch Sp and close, record negative switch two ends closed after voltage V
1, and judge that precharge switch Sp closes the change of voltage at the negative switch S-two ends of front and back | V
1-V
0| whether be more than or equal to a scalar quantity N, scalar quantity N need meet can detect precharge switch Sp close before and after negative switch S-both end voltage have obvious saltus step, if precharge switch Sp close before and after the change of voltage at negative switch S-two ends | V
1-V
0| be more than or equal to a scalar quantity N, then judge that HVDC end (T+, T-) accesses inverter, allow vehicle management system VMS to send high pressure and to power on instruction, otherwise export HVDC and rectify pole (T+, T-) and do not access fault of converter signal.The electric drive system for electric vehicles HVDC end open circuit diagnostic system of embodiment one, power in flow process at high pressure, the situation of change of the negative switch both end voltage before and after being closed by precharge switch can safety, whether effective detection HVDC end accesses inverter, and due to when precharge switch Sp starts closed, positive switch S+ and negative switch S-is in off-state, even if HVDC end (T+, T-) inverter is not connected, also high pressure risk can not be brought, HVDC end (T+ can be evaded, T-) the potential high pressure risk that high-voltage interlocking (HVIL) brings is not designed, simple and convenient, be easy to transformation, implementation cost is low.
The implementation result of specific embodiment is verified by Portunus simulation software.With certain actual electrical drive system for simulation object, high-tension battery voltage is 300V, in inverter, electric capacity C capacitance is 500 μ F, the initial both end voltage of electric capacity C is 0V, positive switch S+ and negative switch S-disconnects, to precharge switch Sp step signal (closed from being disconnected to), negative switch S-both sides voltage is observed by open circuit voltage detecting device VM, from result of a measurement, as HVDC end (T+, when T-) accessing inverter, negative switch S-both end voltage jumps to 300V from 0, there is obvious saltus step, if without obvious saltus step, then battery management system BMS controls to stop high pressure powering on immediately.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (6)
1. an electric drive system for electric vehicles HVDC end open circuit diagnostic system, is characterized in that, comprise positive switch, precharge switch, pre-charge resistance, negative switch, open circuit voltage detecting device, battery management system;
Described precharge switch and pre-charge resistance are parallel to positive switch two ends after connecting;
Described open circuit voltage detecting device, is installed in parallel in negative switch two ends, is used for detecting the magnitude of voltage at negative switch two ends;
Described positive switch two ends, rectify between pole for being connected on high-tension battery anode with HVDC;
Described negative switch two ends, for being connected on high-tension battery negative terminal with between HVDC end negative pole;
HVDC rectifies pole, for being connected to inverter positive input terminal;
HVDC end negative pole, for being connected to inverter negative input end;
Described battery management system, for controlling described positive switch, precharge switch, negative switch break-make, and with open circuit voltage detecting device, whole-control system communication; Described battery management system, working process is as follows:
One. control positive switch, precharge switch, negative switch are all in off-state;
If two. receive high pressure and to power on desired signal, then carry out step 3;
Three. the closed front voltage V at the negative switch two ends that record open circuit voltage detecting device detects
0;
Four. control precharge switch and close;
Five. the closed rear voltage V at the negative switch two ends that record open circuit voltage detecting device detects
1;
If six. | V
1-V
0| <N, N are the positive number demarcated, then export HVDC end and do not access fault of converter signal, carry out step 12; Otherwise carry out step 7;
Seven. send HVDC and rectify normal access signal to vehicle management system;
Eight. to power on instruction when receiving high pressure that vehicle management system sends, then control negative switch and close;
If nine. in setting-up time, precharge does not complete, then export precharge failure breakdown signal, carry out step 12; If precharge completes in setting-up time, then carry out step 10;
Ten. control positive switch and close;
11. high pressure powers on successfully, terminates;
12. high pressure powers on unsuccessfully, controls positive switch, precharge switch and negative switch and disconnects, terminate.
2. electric drive system for electric vehicles HVDC end open circuit diagnostic system according to claim 1, is characterized in that,
Described positive switch, precharge switch, negative switch are relay or switching valve.
3. electric drive system for electric vehicles HVDC end open circuit diagnostic system according to claim 1,
In step 11, high pressure powers on successfully, and described battery management system controls precharge switch and disconnects, and terminates.
4. electric drive system for electric vehicles HVDC end open circuit diagnostic system according to claim 1, is characterized in that,
In step 4, after described battery management system sends precharge switch Closed control signal, and judge whether precharge switch closes, if precharge switch is closed, then carry out step 5; Otherwise, export precharge switch connection failure breakdown signal, carry out step 12.
5. electric drive system for electric vehicles HVDC end open circuit diagnostic system according to claim 1, is characterized in that,
In step 8, after described battery management system sends negative switch Closed control signal, and judge whether negative switch closes, if negative switch is closed, then carry out step 9; Otherwise output negative pole switch connection failure breakdown signal, carries out step 12.
6. electric drive system for electric vehicles HVDC end open circuit diagnostic system according to claim 1, is characterized in that,
In step 10, after described battery management system sends positive switch Closed control signal, and judge whether positive switch closes, if positive switch is closed, then carry out step 11; Otherwise output cathode switch connection failure breakdown signal, carries out step 12.
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|---|---|---|---|
| CN201410035036.3A CN104802655B (en) | 2014-01-24 | 2014-01-24 | Electric drive system for electric vehicles HVDC end open circuit diagnostic system |
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Cited By (6)
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| CN106274528A (en) * | 2016-08-26 | 2017-01-04 | 朱利东 | There is pre-charge circuit and the method for automatic control function |
| CN106564390A (en) * | 2015-10-12 | 2017-04-19 | 北京新能源汽车股份有限公司 | Electric automobile and high-voltage system, detection method and pre-charging circuit thereof |
| CN107872090A (en) * | 2016-09-27 | 2018-04-03 | 南京南瑞继保电气有限公司 | A kind of energy-storage battery pre-charge circuit and pre-charge method |
| CN108594105A (en) * | 2018-02-07 | 2018-09-28 | 深圳微步信息股份有限公司 | The detection method of mainboard indication lamp control circuit |
| CN109524945A (en) * | 2017-09-19 | 2019-03-26 | 联合汽车电子有限公司 | A kind of protection circuit and its control method and power-supply system |
| CN113071315A (en) * | 2021-03-10 | 2021-07-06 | 重庆长安汽车股份有限公司 | Method and system for detecting connection integrity of high-voltage electrical system of electric automobile |
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| CN113071315A (en) * | 2021-03-10 | 2021-07-06 | 重庆长安汽车股份有限公司 | Method and system for detecting connection integrity of high-voltage electrical system of electric automobile |
| CN113071315B (en) * | 2021-03-10 | 2022-10-11 | 重庆长安汽车股份有限公司 | Method and system for detecting connection integrity of high-voltage electrical system of electric automobile |
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| Publication number | Publication date |
|---|---|
| CN104802655B (en) | 2017-03-29 |
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